'use strict';

const autoprefixer = require('autoprefixer');
const path = require('path');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
const eslintFormatter = require('react-dev-utils/eslintFormatter');
const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
const getClientEnvironment = require('./env');
const paths = require('./paths');

// Webpack uses `publicPath` to determine where the app is being served from.
// In development, we always serve from the root. This makes config easier.
const publicPath = '/';
// `publicUrl` is just like `publicPath`, but we will provide it to our app
// as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
// Omit trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
const publicUrl = '';
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl);

// This is the development configuration.
// It is focused on developer experience and fast rebuilds.
// The production configuration is different and lives in a separate file.
module.exports = {
      // You may want 'eval' instead if you prefer to see the compiled output in DevTools.
      // See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
      devtool: 'cheap-module-source-map',
      // These are the "entry points" to our application.
      // This means they will be the "root" imports that are included in JS bundle.
      // The first two entry points enable "hot" CSS and auto-refreshes for JS.
      entry: [
            // We ship a few polyfills by default:
            require.resolve('./polyfills'),
            // Include an alternative client for WebpackDevServer. A client's job is to
            // connect to WebpackDevServer by a socket and get notified about changes.
            // When you save a file, the client will either apply hot updates (in case
            // of CSS changes), or refresh the page (in case of JS changes). When you
            // make a syntax error, this client will display a syntax error overlay.
            // Note: instead of the default WebpackDevServer client, we use a custom one
            // to bring better experience for Create React App users. You can replace
            // the line below with these two lines if you prefer the stock client:
            // require.resolve('webpack-dev-server/client') + '?/',
            // require.resolve('webpack/hot/dev-server'),
            require.resolve('react-dev-utils/webpackHotDevClient'),
            // Finally, this is your app's code:
            paths.appIndexJs,
            // We include the app code last so that if there is a runtime error during
            // initialization, it doesn't blow up the WebpackDevServer client, and
            // changing JS code would still trigger a refresh.
      ],
      output: {
            // Add /* filename */ comments to generated require()s in the output.
            pathinfo: true,
            // This does not produce a real file. It's just the virtual path that is
            // served by WebpackDevServer in development. This is the JS bundle
            // containing code from all our entry points, and the Webpack runtime.
            filename: 'static/js/bundle.js',
            // There are also additional JS chunk files if you use code splitting.
            chunkFilename: 'static/js/[name].chunk.js',
            // This is the URL that app is served from. We use "/" in development.
            publicPath: publicPath,
            // Point sourcemap entries to original disk location (format as URL on Windows)
            devtoolModuleFilenameTemplate: info =>
                  path.resolve(info.absoluteResourcePath).replace(/\\/g, '/'),
      },
      resolve: {
            // This allows you to set a fallback for where Webpack should look for modules.
            // We placed these paths second because we want `node_modules` to "win"
            // if there are any conflicts. This matches Node resolution mechanism.
            // https://github.com/facebookincubator/create-react-app/issues/253
            modules: ['node_modules', paths.appNodeModules].concat(
                  // It is guaranteed to exist because we tweak it in `env.js`
                  process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
            ),
            // These are the reasonable defaults supported by the Node ecosystem.
            // We also include JSX as a common component filename extension to support
            // some tools, although we do not recommend using it, see:
            // https://github.com/facebookincubator/create-react-app/issues/290
            // `web` extension prefixes have been added for better support
            // for React Native Web.
            extensions: ['.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx'],
            alias: {

                  // Support React Native Web
                  // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
                  'react-native': 'react-native-web',
            },
            plugins: [
                  // Prevents users from importing files from outside of src/ (or node_modules/).
                  // This often causes confusion because we only process files within src/ with babel.
                  // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
                  // please link the files into your node_modules/ and let module-resolution kick in.
                  // Make sure your source files are compiled, as they will not be processed in any way.
                  new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
            ],
      },
      module: {
            strictExportPresence: true,
            rules: [
                  // TODO: Disable require.ensure as it's not a standard language feature.
                  // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
                  // { parser: { requireEnsure: false } },

                  // First, run the linter.
                  // It's important to do this before Babel processes the JS.
                  {
                        test: /\.(js|jsx|mjs)$/,
                        enforce: 'pre',
                        use: [
                              {
                                    options: {
                                          formatter: eslintFormatter,
                                          eslintPath: require.resolve('eslint'),

                                    },
                                    loader: require.resolve('eslint-loader'),
                              },
                        ],
                        include: paths.appSrc,
                  },
                  {
                        // "oneOf" will traverse all following loaders until one will
                        // match the requirements. When no loader matches it will fall
                        // back to the "file" loader at the end of the loader list.
                        oneOf: [
                              // "url" loader works like "file" loader except that it embeds assets
                              // smaller than specified limit in bytes as data URLs to avoid requests.
                              // A missing `test` is equivalent to a match.
                              {
                                    test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
                                    loader: require.resolve('url-loader'),
                                    options: {
                                          limit: 10000,
                                          name: 'static/media/[name].[hash:8].[ext]',
                                    },
                              },
                              // Process JS with Babel.
                              {
                                    test: /\.(js|jsx|mjs)$/,
                                    include: paths.appSrc,
                                    loader: require.resolve('babel-loader'),
                                    options: {

                                          // This is a feature of `babel-loader` for webpack (not Babel itself).
                                          // It enables caching results in ./node_modules/.cache/babel-loader/
                                          // directory for faster rebuilds.
                                          cacheDirectory: true,
                                    },
                              },
                              // "postcss" loader applies autoprefixer to our CSS.
                              // "css" loader resolves paths in CSS and adds assets as dependencies.
                              // "style" loader turns CSS into JS modules that inject <style> tags.
                              // In production, we use a plugin to extract that CSS to a file, but
                              // in development "style" loader enables hot editing of CSS.
                              {
                                    test: /\.css$/,
                                    use: [
                                          require.resolve('style-loader'),
                                          {
                                                loader: require.resolve('css-loader'),
                                                options: {
                                                      importLoaders: 1,
                                                },
                                          },
                                          {
                                                loader: require.resolve('postcss-loader'),
                                                options: {
                                                      // Necessary for external CSS imports to work
                                                      // https://github.com/facebookincubator/create-react-app/issues/2677
                                                      ident: 'postcss',
                                                      plugins: () => [
                                                            require('postcss-flexbugs-fixes'),
                                                            autoprefixer({
                                                                  browsers: [
                                                                        '>1%',
                                                                        'last 4 versions',
                                                                        'Firefox ESR',
                                                                        'not ie < 9', // React doesn't support IE8 anyway
                                                                  ],
                                                                  flexbox: 'no-2009',
                                                            }),
                                                      ],
                                                },
                                          },
                                    ],
                              },
                              // "file" loader makes sure those assets get served by WebpackDevServer.
                              // When you `import` an asset, you get its (virtual) filename.
                              // In production, they would get copied to the `build` folder.
                              // This loader doesn't use a "test" so it will catch all modules
                              // that fall through the other loaders.
                              {
                                    // Exclude `js` files to keep "css" loader working as it injects
                                    // its runtime that would otherwise processed through "file" loader.
                                    // Also exclude `html` and `json` extensions so they get processed
                                    // by webpacks internal loaders.
                                    exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/, /\.scss$/],
                                    loader: require.resolve('file-loader'),
                                    options: {
                                          name: 'static/media/[name].[hash:8].[ext]',
                                    },
                              },
                              {
                                    test: /\.scss$/,
                                    loaders: ['style-loader', 'css-loader', 'sass-loader'],
                              },
                        ],
                  },
                  // ** STOP ** Are you adding a new loader?
                  // Make sure to add the new loader(s) before the "file" loader.
            ],
      },
      plugins: [
            // Makes some environment variables available in index.html.
            // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
            // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
            // In development, this will be an empty string.
            new InterpolateHtmlPlugin(env.raw),
            // Generates an `index.html` file with the <script> injected.
            new HtmlWebpackPlugin({
                  inject: true,
                  template: paths.appHtml,
            }),
            // Add module names to factory functions so they appear in browser profiler.
            new webpack.NamedModulesPlugin(),
            // Makes some environment variables available to the JS code, for example:
            // if (process.env.NODE_ENV === 'development') { ... }. See `./env.js`.
            new webpack.DefinePlugin(env.stringified),
            // This is necessary to emit hot updates (currently CSS only):
            new webpack.HotModuleReplacementPlugin(),
            // Watcher doesn't work well if you mistype casing in a path so we use
            // a plugin that prints an error when you attempt to do this.
            // See https://github.com/facebookincubator/create-react-app/issues/240
            new CaseSensitivePathsPlugin(),
            // If you require a missing module and then `npm install` it, you still have
            // to restart the development server for Webpack to discover it. This plugin
            // makes the discovery automatic so you don't have to restart.
            // See https://github.com/facebookincubator/create-react-app/issues/186
            new WatchMissingNodeModulesPlugin(paths.appNodeModules),
            // Moment.js is an extremely popular library that bundles large locale files
            // by default due to how Webpack interprets its code. This is a practical
            // solution that requires the user to opt into importing specific locales.
            // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
            // You can remove this if you don't use Moment.js:
            new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
      ],
      // Some libraries import Node modules but don't use them in the browser.
      // Tell Webpack to provide empty mocks for them so importing them works.
      node: {
            dgram: 'empty',
            fs: 'empty',
            net: 'empty',
            tls: 'empty',
            child_process: 'empty',
      },
      // Turn off performance hints during development because we don't do any
      // splitting or minification in interest of speed. These warnings become
      // cumbersome.
      performance: {
            hints: false,
      },
};
